#include<iostream>  
#include<cstdio>  
#include<string>  
using namespace std;  
string x,y;  
void sep(string x,string y)  
{  
    string r=y.substr(y.length()-1,1);  
    int i=x.find(r);  
    cout<<r;  
    if(i>0)  
        sep(x.substr(0,i),y.substr(0,i));  
    if(i<x.length()-1)  
        sep(x.substr(i+1,x.length()-i-1),y.substr(i,y.length()-1-i));  
}  
int wjh()  
{  
    freopen("nlr.in","r",stdin);      
    freopen("nlr.out","w",stdout);  
    cin>>x>>y;  
    sep(x,y);  
      
return 0;  
}
int W=wjh();
int main()
{
	;
}